Nf Contactor Relays Are Used For Switching Auxiliary And Control Circuits. Nf Contactor Relays Include An Electronic Coil Interface Accepting A Wide Control Voltage Uc Min. ... Uc Max. Only Four Coils Cover Control Voltages Between 24...500 V 50/60 Hz Or 20...500 V Dc. Nf Contactor Relays Can Manage Large Control Voltage Variations. One Coil Can Be Used For Different Control Voltages Used Worldwide Without Any Coil Change. Nf Contactor Relays Have Built-In Surge Protection And Do Not Require Additional Surge Suppressors. - Poles: 8-Pole Contactor Relays With A Non-Removable Front-Mounted Auxiliary Contact Block (Mechanically-Linked Auxiliary Contacts Compliant With Annex L Of Iec 60947-5-1 And Including The &Quot;Mechanically Linked&Quot; Symbol On The Contactor Relay Side) - Control Circuit: Ac Or Dc Operated - Accessories: A Wide Range Of Accessories Is Available.